ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 195

IC MCU AVR 64K FLASH 64TQFP

ATMEGA649A-AU

Manufacturer Part Number
ATMEGA649A-AU
Description
IC MCU AVR 64K FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA649A-AU

Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
SPI, USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
54
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA649A-AU
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATMEGA649A-AUR
Manufacturer:
Atmel
Quantity:
10 000
19.10 Examples of Baud Rate Setting
Table 19-4.
1.
8284A–AVR–10/10
Baud
Rate
(bps)
Max.
115.2k
230.4k
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
2400
4800
9600
250k
(1)
UBRR = 0, Error = 0.0%
UBRRn
25
12
6
3
2
1
1
0
62.5 kbps
Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
U2Xn = 0
f
Error
-18.6%
osc
-7.0%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
= 1.0000 MHz
For standard crystal and resonator frequencies, the most commonly used baud rates for asyn-
chronous operation can be generated by using the UBRRn settings in
UBRRn values which yield an actual baud rate differing less than 0.5% from the target baud
rate, are bold in the table. Higher error ratings are acceptable, but the Receiver will have less
noise resistance when the error ratings are high, especially for large serial frames (see
chronous Operational Range” on page
equation:
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
UBRRn
51
25
12
8
6
3
2
1
1
0
U2Xn = 1
125 kbps
Error
-18.6%
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
UBRRn
47
23
11
7
5
3
2
1
1
0
115.2 kbps
Error[%]
U2Xn = 0
f
osc
Error
-25.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
=
= 1.8432 MHz
BaudRate
------------------------------------------------------- - 1
192). The error values are calculated using the following
UBRRn
BaudRate
95
47
23
15
11
230.4 kbps
7
5
3
2
1
0
U2Xn = 1
Closest Match
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
UBRRn
51
25
12
8
6
3
2
1
1
0
100%
U2Xn = 0
125 kbps
f
osc
Error
-18.6%
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
Table 19-3 on page
= 2.0000 MHz
UBRRn
103
51
25
16
12
8
6
3
2
1
0
U2Xn = 1
250 kbps
Error
-3.5%
-7.0%
”Asyn-
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
8.5%
0.0%
193.
195

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